US11149594B2 - Method of setting tappet clearance and device therefor - Google Patents
Method of setting tappet clearance and device therefor Download PDFInfo
- Publication number
- US11149594B2 US11149594B2 US16/999,093 US202016999093A US11149594B2 US 11149594 B2 US11149594 B2 US 11149594B2 US 202016999093 A US202016999093 A US 202016999093A US 11149594 B2 US11149594 B2 US 11149594B2
- Authority
- US
- United States
- Prior art keywords
- adjusting screw
- movement amount
- return
- rotation
- valve stem
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
- F01L1/00—Valve-gear or valve arrangements, e.g. lift-valve gear
- F01L1/20—Adjusting or compensating clearance
- F01L1/22—Adjusting or compensating clearance automatically, e.g. mechanically
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
- F01L1/00—Valve-gear or valve arrangements, e.g. lift-valve gear
- F01L1/12—Transmitting gear between valve drive and valve
- F01L1/14—Tappets; Push rods
- F01L1/16—Silencing impact; Reducing wear
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
- B25B—TOOLS OR BENCH DEVICES NOT OTHERWISE PROVIDED FOR, FOR FASTENING, CONNECTING, DISENGAGING OR HOLDING
- B25B13/00—Spanners; Wrenches
- B25B13/48—Spanners; Wrenches for special purposes
- B25B13/488—Spanners; Wrenches for special purposes for connections where two parts must be turned in opposite directions by one tool
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
- B25B—TOOLS OR BENCH DEVICES NOT OTHERWISE PROVIDED FOR, FOR FASTENING, CONNECTING, DISENGAGING OR HOLDING
- B25B21/00—Portable power-driven screw or nut setting or loosening tools; Attachments for drilling apparatus serving the same purpose
- B25B21/002—Portable power-driven screw or nut setting or loosening tools; Attachments for drilling apparatus serving the same purpose for special purposes
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
- B25B—TOOLS OR BENCH DEVICES NOT OTHERWISE PROVIDED FOR, FOR FASTENING, CONNECTING, DISENGAGING OR HOLDING
- B25B23/00—Details of, or accessories for, spanners, wrenches, screwdrivers
- B25B23/0064—Means for adjusting screwing depth
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
- F01L1/00—Valve-gear or valve arrangements, e.g. lift-valve gear
- F01L1/12—Transmitting gear between valve drive and valve
- F01L1/14—Tappets; Push rods
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
- F01L1/00—Valve-gear or valve arrangements, e.g. lift-valve gear
- F01L1/12—Transmitting gear between valve drive and valve
- F01L1/18—Rocking arms or levers
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
- F01L1/00—Valve-gear or valve arrangements, e.g. lift-valve gear
- F01L1/12—Transmitting gear between valve drive and valve
- F01L1/18—Rocking arms or levers
- F01L1/185—Overhead end-pivot rocking arms
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
- F01L1/00—Valve-gear or valve arrangements, e.g. lift-valve gear
- F01L1/20—Adjusting or compensating clearance
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
- F01L1/00—Valve-gear or valve arrangements, e.g. lift-valve gear
- F01L1/46—Component parts, details, or accessories, not provided for in preceding subgroups
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
- F01L1/00—Valve-gear or valve arrangements, e.g. lift-valve gear
- F01L1/46—Component parts, details, or accessories, not provided for in preceding subgroups
- F01L1/462—Valve return spring arrangements
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
- F01L1/00—Valve-gear or valve arrangements, e.g. lift-valve gear
- F01L1/02—Valve drive
- F01L1/04—Valve drive by means of cams, camshafts, cam discs, eccentrics or the like
- F01L1/047—Camshafts
- F01L1/053—Camshafts overhead type
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
- F01L2303/00—Manufacturing of components used in valve arrangements
- F01L2303/01—Tools for producing, mounting or adjusting, e.g. some part of the distribution
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
- F01L2305/00—Valve arrangements comprising rollers
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
- F01L2820/00—Details on specific features characterising valve gear arrangements
- F01L2820/02—Formulas
Definitions
- the present invention relates to a method of setting tappet clearance and a device therefor, by which a tappet clearance between a valve stem end and an end surface of an adjusting screw screwed into an acting end of a rocker arm is set to a prescribed clearance.
- a valve opening time and a valve lift amount of the intake/exhaust valve change.
- a clearance (a gap) between an end surface of an adjusting screw screwed into an acting end of a rocker arm, and a valve stem end, that is, a tappet clearance, is set.
- JPA62-000610 discloses technology relating to a method of setting tappet clearance.
- the tappet clearance is set to an optimal value characteristic of a type of the engine, and a value of the tappet clearance has an extremely narrow dimension. Therefore, a setting error with respect to the required value of the tappet clearance (clearance error) needs to be even smaller, and high precision will be required thereof.
- the end surface (an abutting surface on the valve stem end, for example, a rounded end-processed end surface) of the adjusting screw includes therein processing distortion (alternatively referred to as undulation) or the like within a tolerance.
- the tappet clearance at a position of the acting end of the rocker arm includes an error caused by the processing distortion or the like of the end surface of the adjusting screw.
- the present invention which has been made in view of such problems, has an object of providing a method of setting tappet clearance and a device therefor, by which a tappet clearance is easily set to a prescribed clearance, even when there is an error generating factor such as processing distortion of an end surface of an adjusting screw.
- One aspect of the present invention is a method of setting tappet clearance by which a tappet clearance between an end surface of an adjusting screw screwed into an acting end of a rocker arm, and a valve stem end, is set to a prescribed clearance, the method including: a step of starting return rotation of the adjusting screw from a position where the end surface of the adjusting screw is abutting on the valve stem end due to weight of the rocker arm on an acting end side, and a pressing torque on the valve stem end has a zero value, the return rotation being started in a state where the abutting is being continued; a step of, when rotation is being returned in the state where the abutting is being continued, continuously measuring, as an undulation movement amount, movement of the end surface of the adjusting screw in both directions in an axial direction of the adjusting screw due to undulation, and continuously calculating, as a screw return movement amount, movement based on a screw pitch in a return direction in the axial direction of the adjusting screw and on a rotation return angle; and
- Another aspect of the present invention is a device that sets tappet clearance by which a tappet clearance between an end surface of an adjusting screw screwed into an acting end of a rocker arm, and a valve stem end, is set to a prescribed clearance
- the device including: a screwdriver configured to rotate the adjusting screw; a return rotation starting unit configured to start return rotation of the adjusting screw by the screwdriver, from a position where the end surface of the adjusting screw is abutting on the valve stem end due to weight of the rocker arm on an acting end side, and a pressing torque on the valve stem end has a zero value, the return rotation being started in a state where the abutting is being continued; a measuring unit configured to, when rotation is being returned in the state where the abutting is being continued, continuously measure, as an undulation movement amount, movement of the end surface of the adjusting screw in both directions in an axial direction of the adjusting screw due to undulation; a return movement amount calculating unit configured to continuously calculate, as a return movement amount
- the tappet clearance can be set to the prescribed clearance in a short time, easily, accurately, and reliably.
- FIG. 1 is a schematic view showing an example of configuration of a tappet clearance setting system comprising a tappet clearance setting device according to an embodiment implementing a method of setting tappet clearance according to an embodiment;
- FIG. 2A is a schematic view showing a clearance in image form
- FIG. 2B is a schematic view showing an actual clearance
- FIG. 2C is a schematic view showing a state where clearance is zero
- FIG. 2D is a schematic view showing a state where a valve spring starts contracting and deforming whereby a valve lowers;
- FIG. 3 is a schematic view provided for explanation of steps of the tappet clearance setting method
- FIG. 4 is a waveform diagram provided for explanation of operation of the tappet clearance setting device.
- FIG. 5 is a schematic explanatory diagram of main processing of the tappet clearance setting device.
- FIG. 1 is a schematic view showing an example of configuration of a tappet clearance setting system 12 comprising a tappet clearance setting device 10 according to an embodiment implementing a method of setting tappet clearance according to an embodiment.
- the tappet clearance setting device 10 is configured from a device main body 14 , and a control device 16 , such as a control panel, which controls the device main body 14 .
- the tappet clearance setting system 12 is configured from, in addition to the tappet clearance setting device 10 , an engine conveying stand 20 which is provided on a baseplate 18 that extends in an arrow B direction (a horizontal direction), and a column 22 supporting the device main body 14 of the tappet clearance setting device 10 .
- the column 22 may be configured by an industrial robot.
- the device main body 14 is provided with a slider (a slide actuator) 26 .
- the column 22 has an arm section 24 inclining in an arrow D direction (an inclined direction) with respect to an arrow A direction (a vertical direction), and the slider 26 is movable on the arm section 24 in the inclined direction D (arrow D direction), and is positioned on and fixedly supported by the column 22 during tappet clearance setting.
- an engine E which is depicted with a part thereof omitted is positioned and placed on the engine conveying stand 20 .
- a cylinder head 100 of the engine E is provided with a valve gear mechanism 200 that mechanically opens an intake port and an exhaust port.
- a valve seat 102 , a valve guide 104 , and a spring seat (a valve spring seat) 106 are fastened to the cylinder head 100 , and a valve spring 110 functioning as a compression spring is interposed between the spring seat 106 and a retainer 108 .
- valve 116 is configured from: a valve face 114 that opens/closes a cylinder chamber; a valve stem 112 ; a spacer 109 fitted to a small diameter section (not illustrated) of the valve stem 112 ; the retainer 108 that holds the valve stem 112 via the spacer 109 ; and the valve guide 104 that guides the valve stem 112 .
- valve stem 112 is movable in an axial direction of the valve stem 112 by being guided by the valve guide 104 in a state of being held by the retainer 108 .
- the valve face 114 is configured capable of seating on the valve seat 102 when the valve 116 is closed.
- a valve stem end 120 of the valve stem 112 projects to an upper side of the retainer 108 .
- valve stem end 120 which is processed into a flat surface is faced by an end surface (in terms of specification, for example, a spherical surface-finished convex surface, a rounded end surface) 124 of an adjusting screw 122 abutting on the valve stem end 120 at a time of intake/exhaust.
- an end surface in terms of specification, for example, a spherical surface-finished convex surface, a rounded end surface
- the adjusting screw 122 is screwed into a screw groove of an acting end 136 of a rocker arm 130 , and is fixed to the acting end 136 of the rocker arm 130 by a lock nut 134 when a tappet clearance has been set to a prescribed clearance.
- the valve gear mechanism 200 which is of end pivot type (swing arm type), is configured from: a cam 53 that moves in conjunction with rotation of a crankshaft (unillustrated); the rocker arm 130 that rocks via a roller 142 with rotation of the cam 53 ; and the valve 116 that moves linearly and is opened/closed via the end surface 124 of the adjusting screw 122 with rocking of the rocker arm 130 .
- the rocker arm 130 comprises, in addition to the acting end 136 into which the adjusting screw 122 is screwed, a pivot shaft 140 (a fulcrum end), and a roller shaft 143 that supports the roller 142 (a force application point) to which rocking of the cam 53 is transmitted.
- the D direction depicted in the column 22 is a direction of an inclined surface of the arm section 24 parallel to an axial direction of the adjusting screw 122 .
- the slider 26 is provided with a gear storage section 28 which is configured integrally with the slider 26 and extends in an F direction orthogonal to the D direction.
- a rolling bearing 30 and a spline bearing 32 are provided in parallel in an arrow F direction, and a gear 36 fitted to an outer ring of the rolling bearing 30 and a gear 34 fitted to an outer surface of the spline bearing 32 are configured so as to mesh with each other.
- a spline shaft of the spline bearing 32 is rotatably attached to a rotating shaft 46 of a nut runner motor 44 .
- the rotating shaft 46 of the nut runner motor 44 which is a servomotor, or the like, extends in a direction parallel to the arrow D direction.
- the nut runner motor 44 is provided with a torque sensor 48 and a rotation sensor 50 .
- the socket 51 rotates via the spline bearing 32 and the gears 34 , 36 , and the lock nut 134 engaging with the engaging section 52 of the socket 51 can be fastened or loosened.
- a screwdriver (a bit) 56 which is a rotating shaft of an electric driver motor 54 and extends in the D direction, is loosely fitted, with a gap, to an inner ring of the rolling bearing 30 .
- the screwdriver 56 is able to advance/retract in the D direction (the axial direction of the adjusting screw 122 ) while rotating.
- a tip of the screwdriver 56 is engagingly attached to a head 123 of the adjusting screw 122 .
- the electric driver motor 54 is provided with a torque sensor 58 and a rotation sensor 60 .
- control device 16 controls rotational drive of the electric driver motor 54 and the nut runner motor 44 .
- a laser displacement meter 62 is positioned on and fixed to an upper surface of the slider 26 in the F direction. Now, the laser displacement meter 62 functions as a length measuring sensor, a measuring unit, and so on.
- a thin circular columnar (thin disk-like) measuring object 64 that rotates integrally with the screwdriver 56 of the electric driver motor 54 , is rotatably attached to the screwdriver 56 .
- the measuring object 64 has a plane surface (a flat surface) 66 extending in a direction orthogonal to the axial direction of the screwdriver 56 (the F direction orthogonal to the D direction).
- the measuring object 64 (the plane surface 66 ) moves integrally with the screwdriver 56 in the D direction, with movement in the axial direction due to rotation of the screwdriver 56 (with movement in the axial direction of the adjusting screw 122 ).
- the displacement meter 62 fixed to the slider 26 irradiates the measuring object 64 (the plane surface 66 ) with a laser light L to measure (actually measure) with high precision a movement amount in the arrow D direction, in other words, both directions in the axial direction of the adjusting screw 122 , based on a reflected laser light of the measuring object 64 (the plane surface 66 ).
- the control device 16 is a computing machine that includes, for example, a CPU (a processor), a memory connected to the CPU, and a timer as a clocking section.
- a CPU a processor
- the control device 16 controls the slider 26 , the nut runner motor 44 , the electric driver motor 54 , and the displacement meter 62 , and controls the tappet clearance setting device 10 in such a manner that a tappet clearance C between the end surface 124 of the adjusting screw 122 and the valve stem end 120 attains a prescribed clearance Cs.
- the control device 16 functions as a return rotation starting unit 72 , a return movement amount calculating unit 74 , a return rotation ending unit 76 , and the like, as will be mentioned later.
- the tappet clearance (hereafter, also simply referred to as clearance) C in image form represents a gap between the end surface 124 of the adjusting screw 122 , and the valve stem end 120 , in a state where the roller 142 of the rocker arm 130 and a cam circle 53 b of the cam 53 have come into contact when the valve 116 is closed.
- valve spring 110 starts contracting and deforming whereby the valve stem 112 lowers, that is, the valve 116 opens.
- cam 53 comprises, in addition to the cam circle 53 b being a circular arc portion, a cam nose 53 r being a projection and opening the valve 116 via the rocker arm 130 .
- control device 16 of the tappet clearance setting device 10 implementing the method of setting tappet clearance according to the embodiment, will be described with reference to the step schematic view of FIG. 3 and the waveform diagram of FIG. 4 .
- the upper waveform indicates a pressing (feeding-in) torque Tr on the adjusting screw 122 measured by the torque sensor 58 of the electric driver motor 54 .
- a downward direction from a 0 value indicates a direction in which the pressing torque increases.
- the middle undulating waveform which is an actual measured value by the displacement meter 62 , indicates an undulation movement amount Du (a movement amount in both directions in the D direction) associated with rotation of the adjusting screw 122 between the valve stem end 120 and the end surface (contact surface) 124 of the adjusting screw 122 in the abutted state.
- the undulation movement amount Du is observed and stored by the control device 16 .
- the lower waveform indicates a screw return movement amount Ds (a calculated value) in the axial direction of the adjusting screw 122 calculated as shown in following expression (1) from a screw pitch p and a rotation return angle ⁇ of the adjusting screw 122 , calculated by the return movement amount calculating unit 74 of the control device 16 .
- Ds p ⁇ / 360° (1)
- the control device 16 drives the slider 26 with a position of the socket 51 of the tappet clearance setting device 10 matched to the lock nut 134 of the adjusting screw 122 of the engine E that has been set on the engine conveying stand 20 , and, at a position where the socket 51 has been outwardly inserted, rotates the nut runner motor 44 in a reverse rotation direction to thereby loosen the lock nut 134 .
- illustration of the lock nut 134 will be omitted to avoid complication.
- a normal rotation driving-in step b from a state where the rocker arm 130 has hung down by its own weight shown in FIG. 2B , the control device 16 feeds in the adjusting screw 122 by normally rotating the adjusting screw 122 , via the screwdriver 56 , by the electric driver motor 54 from time point t 1 ( FIG. 4 ).
- the control device 16 feeds in the adjusting screw 122 by normally rotating the adjusting screw 122 , via the screwdriver 56 , by the electric driver motor 54 from time point t 1 ( FIG. 4 ).
- the acting end 136 of the rocker arm 130 simply rises in the axial direction of the adjusting screw 122 , as shown in FIG. 2C .
- a normal rotation driving-in stopping step c when the pressing torque Tr becomes a reference torque Ts being a predetermined small torque (a torque at which the valve spring 110 slightly elastically deforms), normal rotation of the electric driver motor 54 is stopped, whereby rotation of the adjusting screw 122 is stopped.
- the tappet clearance C between the end surface 124 of the adjusting screw 122 and the valve stem end 120 is in a state of C ⁇ 0 value (a state where the valve spring 110 is contracting by elastically deforming).
- a first reverse rotation step (a first loosening operation step) d
- the electric driver motor 54 is reverse-rotated to move the adjusting screw 122 in a return direction (an upward direction in the D direction).
- this first reverse rotation stopping step (zero-point detection and setting step) e, in other words, at a position where the end surface 124 of the adjusting screw 122 is abutting on the valve stem end 120 due to weight of the rocker arm 130 on the acting end 136 side, and the pressing torque Tr on the valve stem end 120 has a zero value, the return rotation starting unit 72 of the control device 16 resets the undulation movement amount Du being an actual measured value by the displacement meter 62 to a zero value, and resets the screw return movement amount Ds of the adjusting screw 122 to a zero value. That is, the clearance C between the end surface 124 of the adjusting screw 122 and the valve stem end 120 is set to 0 value.
- a second reverse rotation step (a clearance setting step) f
- the control device 16 reverse-rotationally drives the electric driver motor 54 to reverse-rotate the screwdriver 56
- the return movement amount calculating unit 74 of the control device 16 continuously calculates (calculates in real time) the clearance C being a total movement amount of the continuously detected (real-time-detected) undulation movement amount Du and the continuously calculated (real-time-calculated) screw return movement amount Ds shown in previously described expression (1), as shown in following expression (2).
- C Du+Ds (2)
- the undulation movement amount Du is an actual measured value by the displacement meter 62 by which an amount of up and down movement, from the valve stem end 120 , of the end surface 124 of the adjusting screw 122 during rotation (an amount of movement in both directions in the axial direction of the adjusting screw 122 ) caused by distortion or the like of the end surface 124 of the adjusting screw 122 , is detected as a displacement of the measuring object 64 rotating integrally with the screwdriver 56 and moving in both directions in the D direction. It should be noted that in this case, the end surface 124 of the adjusting screw 122 is continuing the state of abutting on the valve stem end 120 .
- the return movement amount calculating unit 74 continuously calculates the screw return movement amount Ds based on the screw pitch p in a return direction in the axial direction of the adjusting screw 122 and on the rotation return angle ⁇ , and, furthermore, continuously calculates the clearance C being the total movement amount
- the return rotation ending unit (a return rotation monitoring unit) 76 continuously compares magnitudes of the total movement amount C and the prescribed clearance Cs, during the second reverse rotation step (the clearance setting step) f.
- FIG. 5 is a schematic explanatory diagram of main processing of the tappet clearance setting device 10 comprising the control device 16 , up until the clearance C from start time point t 3 of the second reverse rotation step (the clearance setting step) f to end time point t 4 of the second reverse rotation stopping step (the return rotation ending step, the prescribed clearance setting ending step) g, is set to the prescribed clearance Cs.
- the control device 16 rotates the nut runner motor 44 in a predetermined direction, with the position of the socket 51 matched to the lock nut 134 of the adjusting screw 122 , whereby the lock nut 134 is fastened with a prescribed torque (measured by the torque sensor 48 ), and the position of the adjusting screw 122 is thereby fixed at a position of the prescribed clearance Cs.
- the method of setting tappet clearance is a method of setting tappet clearance by which a tappet clearance C between an end surface 124 of an adjusting screw 122 screwed into an acting end 136 of a rocker arm 130 , and a valve stem end 120 , is set to a prescribed clearance Cs, the method including: a step d of starting return rotation of the adjusting screw 122 from a position where the end surface 124 of the adjusting screw 122 is abutting on the valve stem end 120 due to weight of the rocker arm 130 on the acting end 136 side, and a pressing torque Tr on the valve stem end 120 has a zero value, the return rotation being started in a state where the abutting is being continued; a step f of, when rotation is being returned in the state where the abutting is being continued, continuously measuring, as an undulation movement amount Du, movement of the end surface 124 of the adjusting screw 122 in both directions in an axial direction of the adjusting screw 122 due to undulation, and continuously calculating
- the undulation movement amount Du can be easily measured by continuously measuring the movement amount of the screwdriver 56 in the axial direction thereof.
- the undulation movement amount Du may be measured based on output of a rotation sensor 60 provided to the motor 54 .
- the undulation movement amount Du can be easily and highly precisely measured at low cost, by the rotation sensor 60 provided to the motor 54 .
- a measuring object 64 that has a plane surface 66 extending in a direction orthogonal to the axial direction of the screwdriver 56 and rotates integrally with the screwdriver 56 is attached to the screwdriver 56 , and an amount of movement of the plane surface 66 of the measuring object 64 in a normal direction thereof associated with return rotation of the screwdriver 56 is measured by a length measuring sensor 62 and determined as the undulation movement amount Du.
- the undulation movement amount Du can be measured even more accurately by the length measuring sensor 62 .
- the length measuring sensor 62 may be configured to be a laser displacement meter.
- the tappet clearance setting device 10 is a tappet clearance setting device 10 by which a tappet clearance C between an end surface 124 of an adjusting screw 122 screwed into an acting end 136 of a rocker arm 130 , and a valve stem end 120 , is set to a prescribed clearance Cs, the tappet clearance setting device 10 including: a screwdriver 56 capable of rotating the adjusting screw 122 ; a return rotation starting unit 72 configured to start return rotation of the adjusting screw 122 by the screwdriver 56 , from a position where the end surface 124 of the adjusting screw 122 is abutting on the valve stem end 120 due to weight of the rocker arm 130 on the acting end 136 side, and a pressing torque Tr on the valve stem end 120 has a zero value, the return rotation being started in a state where the abutting is being continued; a measuring unit 62 configured to, when rotation is being returned in the state where the abutting is being continued, continuously measure, as an undulation movement amount Du, movement of the
- the present invention is not limited to the above-mentioned embodiment, and it goes without saying that a variety of configurations, such as, for example, replacing the displacement meter 62 such as a laser displacement meter being a non-contact type displacement meter, with a contact type displacement meter whose probe contacts the plane surface 66 of the measuring object 64 , may be adopted based on described content of the present specification.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Valve-Gear Or Valve Arrangements (AREA)
Abstract
Description
Ds=p×θ/360° (1)
C=Du+Ds (2)
Claims (9)
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JPJP2019-153388 | 2019-08-26 | ||
JP2019153388A JP6932749B2 (en) | 2019-08-26 | 2019-08-26 | Tappet clearance setting method and its device |
JP2019-153388 | 2019-08-26 |
Publications (2)
Publication Number | Publication Date |
---|---|
US20210062684A1 US20210062684A1 (en) | 2021-03-04 |
US11149594B2 true US11149594B2 (en) | 2021-10-19 |
Family
ID=74677968
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US16/999,093 Active US11149594B2 (en) | 2019-08-26 | 2020-08-21 | Method of setting tappet clearance and device therefor |
Country Status (4)
Country | Link |
---|---|
US (1) | US11149594B2 (en) |
JP (1) | JP6932749B2 (en) |
CN (1) | CN112431647B (en) |
CA (1) | CA3091123C (en) |
Citations (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3988925A (en) * | 1975-11-21 | 1976-11-02 | Ingersoll-Rand Company | Valve lash adjusting tool and method therefor |
JPS62610A (en) | 1985-06-27 | 1987-01-06 | Honda Motor Co Ltd | Adjustment of tappet clearance and apparatus thereof |
US6205850B1 (en) * | 1999-07-13 | 2001-03-27 | Honda Of America Mfg., Inc. | Method for setting tappet clearance |
US20060130792A1 (en) * | 2003-07-23 | 2006-06-22 | Honda Giken Kogyo Kabushiki Kaisha | Engine valve clearance adjusting method |
US20060288973A1 (en) * | 2002-07-01 | 2006-12-28 | Cinetic Automation Corporation | Valve lash adjustment and inspection apparatus |
US20070266972A1 (en) * | 2004-09-29 | 2007-11-22 | Honda Motor Co.,. Ltd | Automatic Tappet Clearance Adjusting Device and Method |
US20080022956A1 (en) * | 2004-09-29 | 2008-01-31 | Honda Motor Co,. Ltd. | Automatic Tappet Clearance Adjusting Device |
US20110061621A1 (en) * | 2009-09-14 | 2011-03-17 | Atlas Copco Tools & Assembly Systems Llc | Valve Lash Setting Process |
US20190101030A1 (en) * | 2017-10-04 | 2019-04-04 | Sanyo Machine Works, Ltd. | Valve clearance adjusting method |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN100400806C (en) * | 2003-07-23 | 2008-07-09 | 本田技研工业株式会社 | Engine valve clearance adjusting method |
JP2007255231A (en) * | 2006-03-22 | 2007-10-04 | Honda Motor Co Ltd | Method and device for adjusting tappet clearance |
US7600452B2 (en) * | 2007-03-30 | 2009-10-13 | Honda Motor Co., Ltd. | Pneumatic tappet adjustment tool |
CN204492914U (en) * | 2014-12-31 | 2015-07-22 | 惠州比亚迪电池有限公司 | For regulating the controlling device of vehicle valve clearance |
-
2019
- 2019-08-26 JP JP2019153388A patent/JP6932749B2/en active Active
-
2020
- 2020-08-21 US US16/999,093 patent/US11149594B2/en active Active
- 2020-08-25 CN CN202010862615.0A patent/CN112431647B/en active Active
- 2020-08-26 CA CA3091123A patent/CA3091123C/en active Active
Patent Citations (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3988925A (en) * | 1975-11-21 | 1976-11-02 | Ingersoll-Rand Company | Valve lash adjusting tool and method therefor |
JPS62610A (en) | 1985-06-27 | 1987-01-06 | Honda Motor Co Ltd | Adjustment of tappet clearance and apparatus thereof |
US6205850B1 (en) * | 1999-07-13 | 2001-03-27 | Honda Of America Mfg., Inc. | Method for setting tappet clearance |
US20060288973A1 (en) * | 2002-07-01 | 2006-12-28 | Cinetic Automation Corporation | Valve lash adjustment and inspection apparatus |
US20060130792A1 (en) * | 2003-07-23 | 2006-06-22 | Honda Giken Kogyo Kabushiki Kaisha | Engine valve clearance adjusting method |
US20070266972A1 (en) * | 2004-09-29 | 2007-11-22 | Honda Motor Co.,. Ltd | Automatic Tappet Clearance Adjusting Device and Method |
US20080022956A1 (en) * | 2004-09-29 | 2008-01-31 | Honda Motor Co,. Ltd. | Automatic Tappet Clearance Adjusting Device |
US20110061621A1 (en) * | 2009-09-14 | 2011-03-17 | Atlas Copco Tools & Assembly Systems Llc | Valve Lash Setting Process |
US20190101030A1 (en) * | 2017-10-04 | 2019-04-04 | Sanyo Machine Works, Ltd. | Valve clearance adjusting method |
Also Published As
Publication number | Publication date |
---|---|
CA3091123C (en) | 2021-12-07 |
CA3091123A1 (en) | 2021-02-26 |
JP2021032159A (en) | 2021-03-01 |
JP6932749B2 (en) | 2021-09-08 |
CN112431647B (en) | 2022-06-07 |
US20210062684A1 (en) | 2021-03-04 |
CN112431647A (en) | 2021-03-02 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
EP1378741B1 (en) | Valve lash adjustment tool and method | |
JP4827902B2 (en) | Method and apparatus for measuring and adjusting valve clearance | |
US7654174B2 (en) | Tappet clearance adjustment device | |
US6546347B2 (en) | Method and apparatus for automatically setting rocker arm clearances in an internal combustion engine | |
US11149594B2 (en) | Method of setting tappet clearance and device therefor | |
JP6873479B2 (en) | Valve clearance adjustment method | |
JP4112395B2 (en) | Valve clearance adjusting method and adjusting device | |
US9399259B2 (en) | Boring device | |
US7556005B2 (en) | Automatic tappet clearance adjusting device and method | |
JPWO2005008035A1 (en) | Engine valve clearance adjustment method | |
US20080127924A1 (en) | Tappet Clearance Automatic Adjusting Device and Adjusting Method | |
JP2007255231A (en) | Method and device for adjusting tappet clearance | |
JP4255426B2 (en) | Valve clearance adjusting device and adjusting method | |
JP2009293581A (en) | Throttle valve device | |
JP4518055B2 (en) | Method and apparatus for measuring valve lift amount of internal combustion engine | |
JPH07109909A (en) | Valve clearance regulator of engine tappet valve system | |
JP5196176B2 (en) | Variable valve assembly adjustment method | |
JP2009074519A (en) | Adjusting method for variable valve gear | |
JP5465885B2 (en) | Cylinder variation adjustment jig | |
JP4805381B2 (en) | How to set tappet clearance | |
JP2008088964A (en) | Method for adjusting tappet clearance | |
JPH0379527B2 (en) |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
FEPP | Fee payment procedure |
Free format text: ENTITY STATUS SET TO UNDISCOUNTED (ORIGINAL EVENT CODE: BIG.); ENTITY STATUS OF PATENT OWNER: LARGE ENTITY |
|
AS | Assignment |
Owner name: HONDA MOTOR CO., LTD., JAPAN Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:TANUMA, NAOYA;REEL/FRAME:053805/0645 Effective date: 20200916 |
|
STPP | Information on status: patent application and granting procedure in general |
Free format text: DOCKETED NEW CASE - READY FOR EXAMINATION |
|
STPP | Information on status: patent application and granting procedure in general |
Free format text: NOTICE OF ALLOWANCE MAILED -- APPLICATION RECEIVED IN OFFICE OF PUBLICATIONS |
|
STPP | Information on status: patent application and granting procedure in general |
Free format text: PUBLICATIONS -- ISSUE FEE PAYMENT VERIFIED |
|
STCF | Information on status: patent grant |
Free format text: PATENTED CASE |